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/*
* Creative Voice File muxer.
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "voc.h"
typedef struct voc_enc_context {
int param_written;
} voc_enc_context_t;
static int voc_write_header(AVFormatContext *s)
{
ByteIOContext *pb = &s->pb;
const int header_size = 26;
const int version = 0x0114;
if (s->nb_streams != 1
|| s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
return AVERROR_NOTSUPP;
put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
put_le16(pb, header_size);
put_le16(pb, version);
put_le16(pb, ~version + 0x1234);
return 0;
}
static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
{
voc_enc_context_t *voc = s->priv_data;
AVCodecContext *enc = s->streams[0]->codec;
ByteIOContext *pb = &s->pb;
if (!voc->param_written) {
if (enc->codec_tag > 0xFF) {
put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
put_le24(pb, pkt->size + 12);
put_le32(pb, enc->sample_rate);
put_byte(pb, enc->bits_per_sample);
put_byte(pb, enc->channels);
put_le16(pb, enc->codec_tag);
put_le32(pb, 0);
} else {
if (s->streams[0]->codec->channels > 1) {
put_byte(pb, VOC_TYPE_EXTENDED);
put_le24(pb, 4);
put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
put_byte(pb, enc->codec_tag);
put_byte(pb, enc->channels - 1);
}
put_byte(pb, VOC_TYPE_VOICE_DATA);
put_le24(pb, pkt->size + 2);
put_byte(pb, 256 - 1000000 / enc->sample_rate);
put_byte(pb, enc->codec_tag);
}
voc->param_written = 1;
} else {
put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
put_le24(pb, pkt->size);
}
put_buffer(pb, pkt->data, pkt->size);
return 0;
}
static int voc_write_trailer(AVFormatContext *s)
{
put_byte(&s->pb, 0);
return 0;
}
AVOutputFormat voc_muxer = {
"voc",
"Creative Voice File format",
"audio/x-voc",
"voc",
sizeof(voc_enc_context_t),
CODEC_ID_PCM_U8,
CODEC_ID_NONE,
voc_write_header,
voc_write_packet,
voc_write_trailer,
.codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},
};
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